Perovskites like SrRuO3 based on Ru(IV) are common, but Ru(III) oxides are rare although Ru3+ is of great interest as a low spin d5 cation like Ir4+ where strong spin-orbit coupled physics is observed. Recently our group reported a new series of high pressure LnRuO3 perovskites. We have recently used higher pressures to successfully synthesize almost phase-pure YRuO3 with nonmagnetic Y3+ at the A sites. DC and AC magnetisation results suggest that YRuO3 has a rich and complex low temperature magnetic behaviour with 3 low-T transitions, unlike previously-investigated LnRuO3 perovskites that were paramagnetic down to 4 K. High-resolution powder neutron diffraction data are required to provide accurate structural data for YRuO3, and the magnetic scattering will be essential to understand the complex magnetic behaviour. We request 2 days of WISH beam time to collect ~20 temperature points.